On Jun 20, 2011, at 5:52 27PM, John Levine wrote:
They have inquired about IPv6 already, but it's only gone so far as that. I would gladly give them a /64 and be done with it, but my concern is that they are going to want several /64 subnets for the same reason and I don't really *think* it's a legitimate reason.
No legitimate mailer needs more than one /64 per physical network. Same reason.
Note that the OP spoke of assigning them one /64, rather than one per physical net. I also note that ARIN, at least, suggests "/56 for small sites, those expected to need only a few subnets over the next 5 years", which would seem to include this site even without their justification. All they need -- or, I suspect, need to assert -- is to have multiple physical networks. They can claim a production net, a DMZ, a management net, a back-end net for their databases, a developer net, and no one would question an architecture like that.... --Steve Bellovin, https://www.cs.columbia.edu/~smb